Class 5A Large Numbers

LARGE NUMBERS 

April 1, 2020 

Good Morning dear students

Welcome to the new class and our first lesson on Mathematics.

Today we start with our first chapter 'Large Numbers'

By the end of the lesson, you will be able to

• mark the periods of a number.
• write the number names of large numbers.
• read the number name and write its numeral

Can you think of some examples where we use large numbers in our day-to-day life?

• Number of people in India is a large number.
• Distance between two planets in our solar system in kilometers is a very large number

Now let us learn more about large numbers.

First of all recall The Indian Place Value Chart about which you studied in class IV.

Go through the following video:

Video on Indian place value chart

https://youtu.be/vr8nBXDq34k 

           

     So according to the INDIAN SYSTEM, the places under each period are as follows:

                ONES→ones, tens, hundreds

                THOUSANDS- Thousands and ten thousands

                 LAKHS- Lakhs and Ten lakhs

                 CRORES- Crores and Ten crores

                                     

Features of Indian System of Numeration:

• The places in Indian System are grouped under the periods- crores, lakhs, thousands and ones.
• The ones period has three places- ones, tens and hundreds and the rest have two each.
• The periods are separated by a comma while writing a number.
• The digits of a number are grouped in periods starting from right to left.But we read the number from left to right.
• Do not put a comma while writing the number in words.
• We do not use 'and' while writing the number name.

Let us understand reading and writing of numbers with the help of an example.

For eg. Write the number name of 52012318
Soln. As explained above, first we group them into periods starting from right
           C  L  Th  O
           5,20,12,318
Now we write its number name- Five crore twenty lakh twelve thousand three hundred eighteen

Now let us start exercise 1.1
*Take your maths notebook.On the first page, make the index.
*On the next page, write the date and the name of the topic.

We start with Q1 in which we will focus only on the Indian System.
Q1. Mark the periods and write the number name in the Indian System:
(a) 7221016- 72, 21, 016- Seventy two lakhs twenty one thousand sixteen.

Q2. Write the numeral.
  (a) Six crore seven lakh eighty five thousand three hundred sixteen.
As explained above, now we write its numeral
Solution: 7, 07, 85,316

HOMEWORK: Compete Q1. (b) part to (h) part
Complete Q2 (b), (d),  (f) 
So that's all for today! Revise this concept and complete your homework.
Take care and stay safe☺